From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Thierry Volpiatto Newsgroups: gmane.emacs.bugs Subject: bug#25122: 24.5; function describe-variable hangs on large variables Date: Tue, 06 Dec 2016 07:41:13 +0100 Message-ID: <87twahk19y.fsf@gmail.com> References: <20161206022112.GF25778@E15-2016.optimum.net> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1481006531 11601 195.159.176.226 (6 Dec 2016 06:42:11 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 6 Dec 2016 06:42:11 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux) To: 25122@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Dec 06 07:42:07 2016 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cE9S3-0002EG-80 for geb-bug-gnu-emacs@m.gmane.org; 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Tue, 06 Dec 2016 01:41:24 -0500 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1cE9RF-0003H7-C2 for bug-gnu-emacs@gnu.org; Tue, 06 Dec 2016 07:41:17 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 33 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:bEcEURdXTh9gW33ilAFntleJ7AE= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:126543 Archived-At: Boruch Baum writes: > Subject: 24.5; function describe-variable hangs on large variables > > 1) When evaluating function describe-variable for variable > package-archive-conteqnts, emacs hangs for minutes before I gave up. I have already reported this bug. I use this to workaround it: (progn ;; Speedup `describe-variable' for variables with huge value description. (defun tv/describe-variable (old-fn &rest args) ;; `cl-flet' can't be used here because `pp' should ;; appear lexically in its body, which is not the case. ;; Using `flet' is an option, but even better is binding ;; (symbol-function 'pp) with `cl-letf'. (cl-letf (((symbol-function 'pp) (lambda (object &optional stream) (let ((fn (lambda (ob &optional stream) (princ (pp-to-string ob) (or stream standard-output)) (terpri))) (print-circle t)) (if (consp object) (progn (insert "\n(") (mapc fn object) (cl-letf (((point) (1- (point)))) (insert ")"))) (funcall fn object stream)))))) (apply old-fn args))) (advice-add 'describe-variable :around #'tv/describe-variable))